[PATCHv1] hvmloader: add high memory e820 region if needed

[PATCHv1] hvmloader: add high memory e820 region if needed

[David Vrabel]

If the MMIO hole is large and hvmloader needs to relocate memory to
immediately above the 4 GiB boundary, the e820 presented to the guest
will not have a RAM region above 4 GiB.

e.g., a guest with 3 GiB of memory and a 2 GiB MMIO hole will only see
2 GiB.

The required e820 memory region above 4 GiB needs to be added, and not
just filled in.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---
 tools/firmware/hvmloader/e820.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/firmware/hvmloader/e820.c b/tools/firmware/hvmloader/e820.c
index bbde2be..5541b18 100644
--- a/tools/firmware/hvmloader/e820.c
+++ b/tools/firmware/hvmloader/e820.c
@@ -99,6 +99,7 @@ void adjust_memory_map(void)
                 ((uint64_t)hvm_info->high_mem_pgend << PAGE_SHIFT) -
                     memory_map.map[i].addr;
         memory_map.map[i].type = E820_RAM;
+        memory_map.nr_map++;
     }
 }
 
-- 
2.1.4


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Re: [PATCHv1] hvmloader: add high memory e820 region if needed

[Andrew Cooper]

On 14/03/16 17:53, David Vrabel wrote:
> If the MMIO hole is large and hvmloader needs to relocate memory to
> immediately above the 4 GiB boundary, the e820 presented to the guest
> will not have a RAM region above 4 GiB.
>
> e.g., a guest with 3 GiB of memory and a 2 GiB MMIO hole will only see
> 2 GiB.
>
> The required e820 memory region above 4 GiB needs to be added, and not
> just filled in.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

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